Title :
Spectroscopic and laser oscillation characteristics of highly Cr 4+-doped forsterite
Author :
Fujii, Takashi ; Nagano, Masahiro ; Nemoto, Koshichi
Author_Institution :
Komae Res. Lab., Central Res. Inst. of Electr. Power Ind., Tokyo, Japan
fDate :
8/1/1996 12:00:00 AM
Abstract :
We investigated the absorption, fluorescence and lasing characteristics of chromium-doped forsterite with high Cr4+-ion concentration. This crystal has a large absorption coefficient of 3.2 cm-1 at the fundamental wavelength (1064 nm) of Nd: YAG laser which is used as the pump laser. Using this crystal of which size was only 5×5×5 mm3, laser oscillation was achieved by pumping with 1064-nm pulses from a Q-switched Nd:YAG laser. The output energy of over 1.2 mJ and 25% slope efficiency, which is the highest value achieved in the case of pulse operation to our knowledge, were obtained. In this case, 70% of the pump energy was absorbed in the crystal during the first pass through at the maximum output energy
Keywords :
Q-switching; chromium; fluorescence; impurity absorption spectra; infrared spectra; magnesium compounds; optical materials; optical pumping; solid lasers; 1.2 mJ; 1064 nm; 25 percent; 3.2 cm-1; 5 mm; IR spectra; Mg2SiO4:Cr; Nd: YAG laser; Q-switched Nd:YAG laser; absorption; fluorescence; fundamental wavelength; high Cr4+-ion concentration; highly Cr4+-doped forsterite; large absorption coefficient; laser oscillation; laser oscillation characteristics; maximum output energy; output energy; pulse operation; pump energy; pump laser; slope efficiency; spectroscopic characteristics; Absorption; Chromium; Fluorescence; Isotopes; Laser excitation; Laser radar; Optical pulses; Power generation; Pump lasers; Spectroscopy;
Journal_Title :
Quantum Electronics, IEEE Journal of
